Pulley source

[Bellaireroad]

What's a good place to buy an electric motor pulley? I need an 8.5 inch diameter OD , double groove pulley, with a 1.375 ID. Cheapest I've seen is about $75.....thanks


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[My Old Tools]

Local bearing supply houses usually have them or can get them. Otherwise, McMaster-Carr, Grainger, etc.

 

[finn]

Do an online search. I found a place in, I think, Arizona that had an extensive catalog and decent prices. Can't remember the name, but it's an easy search.

 

[Ign]

Sometimes Surplus Center in NE

http://www.surpluscenter.com

 

[Dingleburry]

We get all iur stuff frim applied industrial
https://www.applied.com/categories/power-transmission/sheaves-pulleys/c/586

 

[Firebrick43]

Didn't say if you want A,B,AX,BX,3L,4L,or 5v belts? This sheave (not a pulley) uses A and B with an 8.6 diameter on a set of B belts. Belt profile matters.

https://www.ebay.com/itm/281664626528

The taper bushing is SK

https://www.ebay.com/itm/331708177921

Pulleys with a QD or taper lock bushing are much better than finished bore sheaves.

 

[drink]

What's a good place to buy an electric motor pulley? I need an 8.5 inch diameter OD , double groove pulley, with a 1.375 ID. Cheapest I've seen is about $75.....thanks


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That is a big pulley! You might try Amazon once you get an item no/brand to go on. Motion Industries might be able to help you but the cost is unknown without having an account with them.

https://www.motionindustries.com/productCatalogSearch.jsp

Try asking these people if they can make what you need.

http://shop.phoenix-mfg.com/shop-pulleys/double-groove-drive/results,1-150?filter_product=

Call and ask them if they have anything.

http://www.electricmotorwarehouse.com/pulleys-sheaves/

Where did you find it for $75?

 

[Bellaireroad]

Didn't say if you want A,B,AX,BX,3L,4L,or 5v belts? This sheave (not a pulley) uses A and B with an 8.6 diameter on a set of B belts. Belt profile matters.

https://www.ebay.com/itm/281664626528

The taper bushing is SK

https://www.ebay.com/itm/331708177921

Pulleys with a QD or taper lock bushing are much better than finished bore sheaves.

Thanks Yes, I think that's the way I will go ....it will be cheaper too


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[Bellaireroad]

That is a big pulley! You might try Amazon once you get an item no/brand to go on. Motion Industries might be able to help you but the cost is unknown without having an account with them.



https://www.motionindustries.com/productCatalogSearch.jsp



Try asking these people if they can make what you need.



http://shop.phoenix-mfg.com/shop-pulleys/double-groove-drive/results,1-150?filter_product=



Call and ask them if they have anything.



http://www.electricmotorwarehouse.com/pulleys-sheaves/



Where did you find it for $75?

Grainger , really trying to keep the cost down


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[Bellaireroad]

So this is for an air compressor with the 15 inch pump pulley. I was looking at a 7.5 hp motor at 1725 RPM. Which makes the 8 1/2 inch pulley about 970 rpm....which is right in the sweet spot for the pump (800-1200)

Could get a 7 1/2 hp 3450 rpm cheaper, and use a smaller pulley. Downside to that?


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[larry_g]

So this is for an air compressor with the 15 inch pump pulley. I was looking at a 7.5 hp motor at 1725 RPM. Which makes the 8 1/2 inch pulley about 970 rpm....which is right in the sweet spot for the pump (800-1200)

Could get a 7 1/2 hp 3450 rpm cheaper, and use a smaller pulley. Downside to that?


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Is the pump rated for 7.5 hp at 970 rpm? I've seen to many here think that they can up the speed of a compressor without upping the HP of the motor. Just wanting to confirm that you understand the whole picture here that speed/hp/pressure are all interactive. You can't have it all.

Can you provide a link to the compressor specs?

lg
no neat sig line

 

[Bellaireroad]

Yes it is ... rolair k30... came with 7.5 hp motor initially, now has 5 hp... do you have any input on the 3450 RPM motor?

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[larry_g]

Yes it is ... rolair k30... came with 7.5 hp motor initially, now has 5 hp... do you have any input on the 3450 RPM motor?

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A 1725 motor will have the larger torque and may be better suited to pump work. It is what you find on better compressors.

On edit; it looks like your pump is rated 7.5hp at 1200 rpm so the 970 will be great unless you need max CFM and will trade that for noise and wear from running at the higher speed.

lg
no neat sig line

 

[Bellaireroad]

Didn't say if you want A,B,AX,BX,3L,4L,or 5v belts? This sheave (not a pulley) uses A and B with an 8.6 diameter on a set of B belts. Belt profile matters.

https://www.ebay.com/itm/281664626528

The taper bushing is SK

https://www.ebay.com/itm/331708177921

Pulleys with a QD or taper lock bushing are much better than finished bore sheaves.

Thanks again for the great advice and links to ebay, made it easy!

 

[Firebrick43]

Your welcome. Good choice on a 1750 motor, and turning the pump slower. I probably would go even slower myself just for the noise factor but nothing wrong with the compromise of cfm/noise your making, still will be much quieter than at 1200 rpm.

If you have never installed a pulley with seperate hub just make sure you do it evenly and do each bolt in steps. Don't over tighten them, use the specified torque. And if you really want smooth you can put an indicator of a mag base and eliminate all wabble in the pulley by tightening the corresponding bolt to the highest reading. Can get the dead nuts if the manufacture did them point.